<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>tab栏切换</title>
    <script src="jquery-3.4.1.js"></script>

    <style>
        *{
            padding: 0;
            margin: 0;
        }
        ul{
            list-style: none;
        }
        .wrapper{
            width: 1000px;
            height: 475px;
            margin: 0 auto;
            margin-top: 100px;
        }
        .tab{
            border: 1px solid #dddddd;
            border-bottom: 0;
            height: 36px;
            width: 320px;
        }
        .tab li{
            position: relative;
            float: left;
            width: 80px;
            height: 34px;
            line-height: 34px;
            text-align: center;
            cursor: pointer;
            border-top: 4px solid #ffffff;
        }
        .tab span{
            position: absolute;
            right: 0;
            top: 10px;
            background: #dddddd;
            width: 1px;
            height: 14px;
            overflow: hidden;
        }
        .products{
            width: 1002px;
            border: 1px solid #dddddd;
            height: 476px;
        }
        .products .main{
            float: left;
            display: none;
        }
        .products .main.selected {
            display: block;
        }

        .tab li.active {
            border-color: red;
            border-bottom: 0;
        }
    </style>
</head>
<body>\
<script>
    $(function () {
        $(".tab-item").mouseenter(function () {
            //siblings();获取active所有同级元素；
            $(this).addClass("active").siblings().removeClass("active");
            let index=$(this).index();
            $(".main").eq(index).addClass("selected").siblings().removeClass("selected");
        });
    });
</script>
<div class="wrapper">
    <ul class="tab">
        <li class="tab-item active">国际大牌<span>◆</span></li>
        <li class="tab-item">国妆名牌<span>◆</span></li>
        <li class="tab-item">清洁用品<span>◆</span></li>
        <li class="tab-item">男士精品</li>
    </ul>
    <div class="products">
        <div class="main selected">
            <a href="###"><img src="imgs/guojidapai.jpg" alt=""/></a>
        </div>
        <div class="main"><a href="###"><img src="imgs/guozhuangmingpin.jpg" alt=""></a></div>
        <div class="main"><a href="###"><img src="imgs/qingjieyongpin.jpg" alt=""></a></div>
        <div class="main"><a href="###"><img src="imgs/nanshijingpin.jpg" alt=""></a></div>
    </div>
</div>
</body>
</html>